Question

What is the ionic compound of Zn^2+ SO4^2-

Answer 1

\[Zn ^{2+} PO _{4}^{3-}\]

Answer 2

\[ZnSO _{4}\]\[Zn _{3}(PO4)_{2}\]

Answer 3

@matt101 you don't put any roman numerals?

Answer 4

Not when you're writing out the chemical formula. If you were writing the name, then yes. However for zinc, the primary valence is +2 (you rarely see it with any other valence), so it probably isn't a big deal if you omit "(II)".